The practice of surgery . of a horizontal section through theliead of the humerus to indicate the lateral extent of tlie l)urRa, and the necessityfor its existence to allow the greater tuberosity to rotate beneath the deltoid. Noticealso how the tendon of the subscapularis is stretched around the head in the oppositedirection in external rotation. This stretching occurs not in the tendons themselves,which are very short, but in the muscles which, by their construction, take up theslack of the capsule of the joint. In fact, the capsule of the joint is really made upof the tendons and muscular h
The practice of surgery . of a horizontal section through theliead of the humerus to indicate the lateral extent of tlie l)urRa, and the necessityfor its existence to allow the greater tuberosity to rotate beneath the deltoid. Noticealso how the tendon of the subscapularis is stretched around the head in the oppositedirection in external rotation. This stretching occurs not in the tendons themselves,which are very short, but in the muscles which, by their construction, take up theslack of the capsule of the joint. In fact, the capsule of the joint is really made upof the tendons and muscular heUies of these short rotators. It can easily l)e imaginedhow a simultaneous spasm of these muscles would lock the joint, for in the normalmotion one must relax as the otlier contracts. Notice also the cross-section of thecoracobrachialis and the necessity for the subcoracoid bursa which lies betweenit and the subscapularis. Since the two muscles work at right angles to one anotherthe bursa is indispensable (E. A. Codman).. See Fig. 504 (E. A Codman). THE BURSyE 811
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsurgery, bookyear1910
